Sewing-machine



'W.1. GLIDDEN.

SEWING MACHINE.

APPucATmN FILED :UNE 20, 191s.

1,342, 165., Patented June 1,1920.

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WALTER J'. G-LIDDEN, OF SOUTI-IBORO, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, 0F PATERSON, NEW JERSEY, A CORPORATION `OF NEW Y JERSEY. y

iaaiea.

stitcli, outsole, shoe sewing machines which;

employ a curved awl and a' curved hook needle.

Sewing machines of this character are provided with a presser foot, which engages the work and is locked in its work engaging position during the stitch-forming opera tion to hold the work on the'work support, and which is moved out of engagement with the work at the time the Work is fed, so as not to interfere with the feeding movement..

' The object of this invention is to provide novel and improved mechanism for actuat-` ing and locking the presser foot, by means of which the presser foot is 'operated to engage the work so as to clamp the work on the work support, is locked in work engaging position, and is released from the work to permit the same to be fed in a more reliable and satisfactoryjmanner than in machines asv heretofore constructed. 1

With thisobject in view, the invention contemplates the provision in a shoe sewing machine of the class referred to having stitch-forming devices, a work support Vand a presser foot, of yielding means to bring the presser foot into engagement with the work and atthe same time permit it to ac-v commodate itself todiiferent thicknesses of the work, novel means for raising the presser foot duringeacli cycle of operations through a predetermined uniform distance from the position it assumes under the action of the yielding means, and novel locking means for locking the presser foot in its work engaging position.

.' additional feature of the present in- Y Specification of Letters Patent.

SEWING-MACHINE.

Eateiited J une 1,1920.

Application filed .Tune 20, 1918.V Serial No. 240,961. n;

ventionconsists in the provision of means for adjusting the throw of the presser foot actuatingmechanism to correspondingly ady vcontemplates the provision of means for re`v leasing the presser foot lifting clutch when the parts are in normal position, so as to permit the presserfoot to be lifted manually without interference by the clutch mecha-i nism. y e

Certain other features of the invention re late to improved constructions, combinations and arrangements of parts hereinafter described and claimed, thel advantages of which are set forth in the followingdetailed description. e

Inthe drawings illustrating the preferred embodiment of the invention, Figure l is a y vertical longitudinal section showing the parts of the presser :foot mechanism 'in side elevation; Fig. 2 is a sectional view of ythe locking device on the line 2 2 of Fig. l, and looking in the direction of the arrows; Fig. 3 is a sectional view of the locking device on the line 3 3 of Fig. l, looking in the direction ofthe arrows; Fig. 4 is a detail view, in side elevation, of the clutch device for lifting the presser foot lever.

In the machine illustrated in the'drawings, the work is supported between a work support 2 and the presser foot 4. The work support is of the usual construction, being secured toA a stationary part of the'machine frame and being formed to enterthe crease between the upper vandthe welt of a shoe so that the shoe, during the sewing operation, l

is supported with the tread surface of the sole uppermost. The work support is provided with the usual slot through which the needle and awl operate.

The presser foot is of the usual construction and is secured to the lower end of a presser foot lever 6. During the greater l part of the cycle of operations of the inaf in work engaging position and remains Vlocked until just be ore the beginning of the feeding operation, whenit is again lifted andv the cycle of operations repeated.

To enable the presser foot to be actuated as abovedescribed, the presser foot is pivotally mounted on a stud 8 fixed in the machine, and has a downwardly 'extending arm 10 to which is secured at its lower end by means Aof a pin 11, a curved arm 12, the function of which will be more particularly -described hereinafter,`and to which is pivotally connected a link 14 connected at its .an arm or lever 28 pivotally mounted on rear end to an arm 16 securedto a rock shaft 18. A spring 20 is connected betweenl the link 14 and anarm 22 secured to a rod 24 by a split clamp 26, by means of which the position of said arm on the rod 24 may beladjusted so as to vary the tension of the spring 20.. Normally, this springtends to pull the link 14 rearwardly, and, by means of the connections above described, to move theV presser foot downwardlyy to yieldingly engage the work. Also, by means of the rock shaft 18-and the usualA connections, the spring 2O operates the thread measuring device in the well-'knownmanneiz To ylift the presser foot to disengage it y from the work during the feeding movement, mechanism is provided consisting of they stud 8 and carryingat its lower end a clutch or gripping device to grip the eX- tending arm 12 whenthe lever 28is positively actuated by the driving shaft A. The lever is actuated by `a link 32 pivotally connected atone end tov a stud 30 secured in the lever 28, and adjustably connected at the otherend in a slot 84 formed in the lower end of the cam lever 36 pivoted on a Vfixed stud 38 and carrying a roll 40 at'its upper end which engages -in a groove in the verticalv face of a disk cam B secured to the main shaft A. The lever 36 is positively oscillated on itspivot when the main shaft is rotated, and when so oscillated rocks the lever 28 on its pivot. As the arm 28 is rocked, the presser foot is positively lifted by means of the clutch device above referred to, which engagesthe arm 12 connected to the presser foot lever.

The clutch device comprises a plate 42, secured by means of a: screw 44 to Vtl'i'elo'wer end of the lever 28. This plate is arranged within the inner surface of the arcuate arm 12. The plate 42 is so designed as to form a recess between its inner face and the arm 12, in which is received a roll 48 which'Lis confined between'a projecting portion of the plate 42 and a latch lever 52 pivotally mounted on the plate 42, as shown in Fig. 4. The recess in the plate 42 is so designed that the roll 48, when inV one end of said recess, is free to turn without engaging the arm 12. If, however, the roll is moved toward the other end of said recess, it will be jammed between the surfaces of the plate 42` and theV arm 12, and will enable the lever 28 to positively .move the arm 12 and to lift the presser foot off the work. Y A spring 50 normally tends to movev the roll: 48 to its clutching position. The clutch roll 48 is held against lateral displacement in the recess between the lever 28 vand the cover plate 29.

The link 32 is adjustably connected inthe slot 34 in order that the lifting movement of the presser foot lifting lever 28 may be adjusted to suit the requirements of the different materials vwhich may be operated upon. rlhe link 32? andthe lever arm' 36 constitute the members of a toggle linkage. YV hen the link 32 is connected in the rear end of the slot 34,-asl shown in Fig. 1, the lever 28 will be given a greater lifting movement, on oscillation of the lever 36,.than it would if the klink were connected ata point intermediate thel ends of the, slot 34. When the lever 28 is in its normal rearmo'stposition, with the presser foot down on the work, the latch lever 52 engages an` abutment 53 which swings the latch lever about its pivot, thusy moving the 4roll 48 forwardly into the enlarged end of theJ recess inthe plate 42 so as to prevent the engagement ofthe clutch devicer with the arm 12, fora purpose hereinafter fully set forth. Nhen the arm 36 is iii-its normal position, as shownin F ig. 1, the slot 34 is concentric to the pivot point of the link 32,*so that ya'change of the ad-V justment of the link 32 in said slot does not change the position of the lever 28, and-in no way interferes with the proper action of I the clutch device.

Devices are provided to release the clutch device when the presser foot is raised out of engagement with the work, throughsuch adistancel as desired, in order to permit the actuating spring 2O to pull the presser foot down into engagement with the work while the presser footis entirely free to move.

These devices comprise a spring-pressed plunger 54 engaging the latch lever52y and held in such a positionfby its spring, duringfthe swinging movement of the lever 28, that the latch lever52` occupies the position shown in Fig. 4, with the clutch roll in its clutching position. As theel-lever 28 is moved forwardly, however, the plunger 54 is adapted to strikeagainst an adjustable abutment screw 56 in an Vupstanding arm of `a bracket 64 secured tothe machine frame and is pushed rearwardlyby said screw. This movement of the plunger operates the latch lever 52 to-- move the clutch roll 48 to ineffective position.l By adjusting the screw 56, the time of the releaseof theclutch device maybe adjusted.V The screw 56 is normally adjusted infaccordance with the adjustment of the link 32 in theslot 34, so asto release .the clutch device at the completion of the lifting movement of the lever 28. When the ad-l justment of4 the link. 32 in the slot 34 is changed, the adjustment ofthis screw 56 is normally changed so as tog'correspond to.

that Vof the link 32. The screw 56 may be so adjusted, however, that it controlsl the lifting of the presser foot by the lever V28.

If, for instance, the link 32 is so adjusted in the slot 34 that the lever 28 is given its maximum lifting movement, they screw. 56 may be so adjusted that itwill release the clutch Vdevice from the arm 12 before the lever 28v haslcompleted its lifting movement.A If such an adjustment of the screw 56 is imade, a part of the lifting movement of the levery 28 is idle, with respect tothe presser foot, andthe lifting of the presser foot is controlled entirely by the adjustment of the screw 56. I

At a certain period'in each ations, .the arm 12 is locked-against movement b a locking device described in detail hereinafter, which prevents any movement of the presser foot rvatthis time.y The arm 12 is unlocked slightly before the feeding Vmovement to permit vthe `presser foot 4 to be lifted olf of the work, asv-above described, and is locked against movement subsequent to the feeding action and just after the spring 20 has drawn the presser foot down into engagement with the work. The mechanism for ypositively locking the arm 12 against .movement comprises a short curved armA 60/pivoted on the rear end of `the arm 12 and having the same degree of curvature as saidaarm. The arm 12 slides in a guldeway formed in the fixed bracketrv 64, and lits closely in said recess so`as to have nov lost motion thereingand to move in ai fixed path, while the short arm 60 slides endwise through a guideway' carried by the locking member 62, which is mounted to slide in a slide-guide formed in the bracket 64 and in a direction substantially radial' cycle of oper-A Y effective.

to the arc of the curvature of theiarm-l2 When the` locking member isin its-ineffective position, thecurved army 60is in exact alinement with the arm V1 2,`andfthe armsIV are freeto slide'e'ndwise in the guidewayfjs.-

Whenthelocking member 62 is moved rearwardly, the arm 60 ismovedout vof aline-A menti with the arm 1,2,. and whenfsaid arm' occupies such position, any attempt to move the arm v12 longitudinally will cause the arm 60 to Vjam in the guideway throughv which said arm passes.

vThe guideway for the armw60 is formed' in a lockingnutl 66 and when the locking member 62 is moved rearwardly, the arm 12 is also clamped between said locking nut and the bracket 64. `The lockingnut 66 has threaded engagement with the locking member 62 by means of a very" steepI thread, as clearly illustrated in `Fig. 2. By reason of the engagement of the: arm 60 with the nut 66, said nut vis turned inthe locking member 62 when the arm 60 is .swung on its pivot,` and 1 by meansof' the steep thread on said nut it is-moved` toward the arm 12, a small space being provided between the inner face of the nut andthe arm 12 to permit this movement of 4saidnut., As the locking -nut is movedjtoward they arm 12, it clampsthe arm 60 against the arm 12, and thus clamps'the arm 12 against thel face of thebracket 64-in which said arm slides.

in various positions of'said arm, the posin The locking member is radapted to be moved to lock the arm ,'12

thickness of the work. Since theshort arm*l 60 is pivoted .at its upper end,wdifferent parts of'said armA are moved throughv different vdistances when the locking member j is moved rearwardly. The locking-nutf66 is therefore turned through different dis- Yi tances by the arm. 60, depending upon the!` relative position of the garm-12 and'lockV-E ing member 62, when the locking' members` isl moved tolocking posit-ion.

It is` desirable to exert the same clamping pressure on the arm 12 by means of the locking mem-- ber 62, in whatever position saidarm mayslljej' be when the locking Vmember becomesin- The Varm 60 is therefore made thicker at its upper end than at its lowerV i end. Y

-The armi-60 is likely'to wear in continually sliding back and forth through thev nut 66,

andin order to take up this wear, the'armv 60 isformed in two parts, indicated in F ig. l

2 as 60aN and 60h. `ljrojecting from the side of the part 601 are pins 70 which extend incre-l cesses formed in the part 60a and on which isc Y said partisfremovably mounted. The part 60a maybe removed by the operator and one orv moreveryl thin plates 7 4 placed between the p'arts60 and`60b, the number of plates depending on the wear'of the parts.

he mechanism for; operating the locking member comprises'a link 7 8 connected to the locking member by lmeans of a'stud 7 6 `rotatably mounted therein; Thisk link is con'- Iiected toL thek forward end of al rock arm secured to therock: shaft 82, journaled forV rotationin the frame of the machine'.` Ad justabl'y secured to the shaft 82 by means of a# split clamp vis an arm 84, having connected at its 'rear` end a depending rod' 86 surrounded by 'a' compressionL spring 88, which normally tends to raisethe arm 84 and rock the shaft 82'ito pull the link 7 8 rearwardly Y and' move the locking vmember to locking position. lThe lock-ing member 62 is, however,

heldin its` forwardA orv unlocking position during abertain period of eachl cycle of v operations, by' means of an upstanding arm 90-piv'oted ori-they rock shaft 82 and having adjustably mountedon its upper end a roll 92 whiehiengages Lin a cam groove formed in the vertical -fa'ce ofthe cam B. The cam operates to'rock the arin 90 on the shaft82,

andvon'thefrearward movement of said arm it engagesfa short arm 94 secured tosaid shaft and'frocks the shaft 82y so -as to` move y the-'locking memberV 62 to unlocking position,

wherev it isf held so long as the arm 90 remainsfin its rea-rward position.

Mechanism is provided by means of which the presser r foot may be manually'raised-L to itsdisengaging position, and at the same v jtime-` theflbcking device maybe moved to in i veffective'or unlocking position. Such mechani-sm consists of a rodj96 extending longitudinally of the machine, ati` its forward endpassing through a recess in the upstand ing arm 98-secured tothe presser foot lever, and atits rear end connected to an upstanding arm 100 securedA to a rock shaft 102 and normally held in forward position by means Aofa .ten-sion spring 104. A nut 10'6is secured to the forward end of the rod 9 6, and

When said Vrod is moved rearwardly, the nut- -engages andmoves rearwardly the arm 98,

positively lifting the presser foot off the also rocksthe arm 100 and swings forwardly a doWnwardly'eXtending arm 108 integral with thearm 100. rIhe arm 108 has at its loweryend a lateral projection 110 in the formvof'a camwhich engages a rollr 112 mounted on an arm 114 vsecured to the rock shaft 82,?and rocks the shaft 82 'to move the locking member 62 tok ineffective position 'one the rearward movement of theV rod j` 96. i The cam 110 is so formed that'the for-f Vward portion of said cam is effective to movef the arm 114 to rock the shaft 82, while the rear'portion of the cam is substantially concentric with the pivot 1-'02 andracts to hold theY locking mechanism inineffective .position. AThere isa certain amount'of lost mo'- tion between the collar 106 andthe arnil 98 to permit thecam 110 to rock theshaft'and re lease tlie locking device before. the collar strikesV the arm 98 r-to liftthe presser footl ofi the work.,` A'fterthe presser foot islifted, y

' itcannot grip the arm 12 when the lifting arm- 28 isv in its normal position. The clutch device is held open when theparts are in normal position, so as to' enable 7thea-rm `12I to moveto itsnormalfposition; after the presser foot is lifted manuallyl' If the` clutch were not released, thearm `1-2 would be gripped by theclutch device, preventing the presser footl from dropping into engagement with the workaftergit had been lifted Y Vfrom thel work by the actionof theirod 96.

The rod 9Gl has a knob or handleat its forward end insuch position as to be conveniently grasped by the operator so vthatfhe may lift the presser foot when it-'isdesired toV remove the workA for any purpose. When the rod 96 is released by the operator,the spring 104 restoresy the parts to no'rmalvpo-l sition.V Means areI provided, as indicated at 116, for adjusting the length of the rod 96.

The nature and scope of the present invention havingbeen indicated and its preferred embodimenthaving been specifically described, what is .claimed asy new is 1. A sewing machine having, in combina` tion, stitchforming devices, a work support, apresser foot, mechanisnifoi actuating the presser foot, comprising a presser foot lever,

an arm extending therefrom, 'a pivoted lever, a clutch device carried by said lever and engaging said arm, and meansfor actuating said pivoted lever to raise the presser foot from'the work. i'

2. A sewing machine havingin Vcombina- I tion, stitch-forming devices, a work support, a'presser foot, mechanismV for, actuating the presserffoot, comprising a presser foot lever,

an arm extending therefrom, a pivoted lever, a'clutch device carried by` said lever and engaging said arm, means for actuating saidpivoted lever to raise said presser foot,

and means operating to release said clutch device vat the completion of the' upward` movement of the presser foot.

3. A sewing machine having, in combination, stitch-forming devices, a work engag- Y v iso ing device, a Vmember movable Vin'a fixed ing device, a member movable in a fixed"V path connected thereto, Van arm pivoted to said member and movable endwise thereby,

a movable guideway for said arm, and means for moving said guideway into and out of alinement with said iixed path.

5. A sewing machine having, in combination, stitch-forming devices, a work support, a presser foot, mechanism for actuating and locking the presser foot, comprising a pivoted lever secured to the presser foot, an arm extending therefrom, a second arm pivoted on said extending arm, a locking member having a recess therein embracing said pivoted arm, a nut threaded in said locking member and having arecess through which said pivoted arm passes, and means for actuating said locking member to swing said arm on its pivot, whereby said nut is moved to lock said extending arm against move-I ment. Y

6. A sewing machine having, in combination, stitch-forming devices, a work support, a presser foot, mechanism for actuating and locking said presser foot, comprising a pivoted lever, an arm extending from said lever, a second arm pivoted thereonand normally alined therewith, a locking member having a recess embracing said pivoted arm, and means for actuating said locking member to move saidpivoted arm out of alinement with said extending arm.

7. A sewing machine having, in combinay tion, stitch-forming devices, a work support, a presser foot, mechanism for actuatiiig'and locking said presser foot, comprising a pivoted lever, a curved arm extending from said lever, a second arm having the same degree of curvature as' said extending arm, pivoted thereon and normally alined therewith, alocking member'having a recess embracing said pivoted arm, means for actuating said locking member to move saidy pivoted arm out of alinement with said extending arm whereby said arm is jammed against longitudinal movement, and a nut threaded in a recess in said locking member and having a recess through which said pivoted arm passes, said nut being actuated by th'e movement of the pivoted arm to clamp said extending arm in position.

8. A sewing machine having, in combination, stitch-formingdevices, a work support, a presser foot, mechanism ,for 'actuat- Y ing andV locking said presser foot, comprising a pivoted lever, an arm extending therefrom, clutch devices gripping said arm, means for actuating saidliclut-ch devices yto operate; the

presser vfoo-t, locking mechanism, and 'means for actuating'said locking to en'-y gage and positively lock sai'dexten'ding arm aip'resser' foot, mechanism kforactuating the y presser foot Comprising a presser vfoot lever, an arm extending therefrom, a clutch device engaging said arm, means for operating the clutch device to lift the presser foot, and means for releasing the`clutch device from said arm at the end of the lifting movemen of the presser foot.

10. A sewing machine having, in combination, stitch formingdevices, aawork support, a presser foot, mechanism for actuating the presser foot comprising a presser foot lever, an arm extending therefrom, a clutch device engaging said arm, means for operating the clutch device to lift the presser foot, andadjustable means for releasing the clutch device from said arm, to adjust the lifting movement of the presser foot.

11. A sewing machine having, in combination, stitch-forming devices, a worksup- A port, a presser foot, mechanism for actuating V.the vvpresser foot comprising a presser foot lever, means for operating the vlever to lift the presserfoot, connections between said lever and theioperating means, and adjustable means for releasing said connections to control the lifting movement of the presser foot.V

12. A sewing machine having, in combination, stitch-forming devices, a work support, a presser foot, mechanism for operating the presser foot, comprising a presser foot lever, means for operating the lever to lift the presser foot, means for adjusting the movement ofA said operating means to' control the lifting movement of the presser foot, connections between the presser. foot lever and said operating means, and Vadjustable means'for releasing the connections between the operating means and the presser foot lever.

13. A sewing machine having, in combination, stitch-forming devices, a work support, a presser foot, mechanism for actuating said presser foot comprising a presser foot lever,

lan arm extending therefrom, a pivoted lever,

a clutch device carried by said lever and engaging said arm, means for actuating said pivoted lever to lift the-presser foot, adjustable means for controlling the lifting movei ment of said lever, and adjustable means for releasing the clutch device at theend of the vlifting lmovement of said lever.

14. A sewing machine having, in combination, stitch-forming devices, a work support, presser foot, mechanism for actuating the presser foot, comprising a presser foot lever, an arm connected to said'presser foot lever,

a pvofted lever,V a Clutchearried by said `pivv,Qted lever. andengaging said arm, .means for aetuaftinglsaid pivtedlever tolift the presser lfoot, .and :means y@for releasing Asaid clutch from said arm when saidl'piyted lever iszin ,normalpositiony (tion,V stitcheformingdevices,.a Work su'ppQrt,

' a presser ,ffoQtv,:1neehanism for aetuating the ,presser foot, comprising aipresser Vvfoot lever, 10 an arm connected tosaid presser footf-yvlever, means ,engaging said arm troiloekftghe Vpresser -foot in Work engaging positien7 means for Y releasing .said lockingemeans, andrmeafnsen- Y v gaglng said arm to lift the presser footoff 15 15. A sewing machine having, in. combinathe iWork. 

